/*
 * Copyright 2012 Finbudget.com
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package finbudgettable.client.ui.grid.cell;

import java.util.Comparator;

public class CommonComparator<T extends Comparable<T>> implements Comparator<T> {

    public static <T extends Comparable<T>> int compareTo(T o1, T o2) {
        if (o1 == null && o2 == null) {
            return 0;
        }
        if (o1 == null) {
            return -1;
        }
        if (o2 == null) {
            return 1;
        }
        return o1.compareTo(o2);
    }

    @Override
    public int compare(T o1, T o2) {
        return compareTo(o1, o2);
    }

    public static <T extends Comparable<T>> boolean isEqual(T o1, T o2) {
        return compareTo(o1, o2) == 0;
    }

    public static <T extends Comparable<T>> boolean isNotEqual(T o1, T o2) {
        return compareTo(o1, o2) != 0;
    }

    public static <T extends Comparable<T>> boolean isGreater(T o1, T o2) {
        return compareTo(o1, o2) > 0;
    }

    public static <T extends Comparable<T>> boolean isGreaterOrEqual(T o1, T o2) {
        return compareTo(o1, o2) >= 0;
    }

    public static <T extends Comparable<T>> boolean isLess(T o1, T o2) {
        return compareTo(o1, o2) < 0;
    }

    public static <T extends Comparable<T>> boolean isLessOrEqual(T o1, T o2) {
        return compareTo(o1, o2) <= 0;
    }
}
